/*
 *  Licensed to the Apache Software Foundation (ASF) under one
 *  or more contributor license agreements.  See the NOTICE file
 *  distributed with this work for additional information
 *  regarding copyright ownership.  The ASF licenses this file
 *  to you under the Apache License, Version 2.0 (the
 *  "License"); you may not use this file except in compliance
 *  with the License.  You may obtain a copy of the License at
 * 
 *  http://www.apache.org/licenses/LICENSE-2.0
 * 
 *  Unless required by applicable law or agreed to in writing,
 *  software distributed under the License is distributed on an
 *  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 *  KIND, either express or implied.  See the License for the
 *  specific language governing permissions and limitations
 *  under the License.
 */
package org.apache.myfaces.trinidadinternal.image.painter;

import java.awt.Color;
import java.awt.Graphics;

/**
 * Abstract baseclass for Painters that change the color of the graphics
 * state passed to their wrapped painters.
 * <p>
 * @version $Name:  $ ($Revision: 171 $) $Date: 2008-11-14 12:06:34 +0800 (Fri, 14 Nov 2008) $
 */
public abstract class ColorChange extends AbstractWrappingPainter
{
  public ColorChange(
    Painter wrappedPainter
    )
  {
    super(wrappedPainter);
  }


  /**
   * Paints the text at the specified coordinates.
   */
  @Override
  public void paint(
    PaintContext context,
    Graphics     g,
    int          x,
    int          y,
    int          width,
    int          height
    )
  {
    Color newColor = getColor(context);

    Color savedColor = null;

    if (newColor != null)
    {
      savedColor = g.getColor();
      g.setColor(newColor);
    }

    super.paint(context, g, x, y, width, height);

    if (savedColor != null)
    {
      g.setColor(savedColor);
    }
  }


  protected abstract Color getColor(PaintContext context);
}



